An “inquisitive” humpback whale that wandered from its usual migratory route and into the centre of Sydney Harbour is causing “navigational challenges” for ferries and vessels as its tour of the world-famous harbour continues. The sub-adult whale was spotted by commuters on a harbour ferry service near Fort Denison about 8am on Wednesday. 0:24 Humpback whale seen in Sydney Harbour – videoBy late afternoon on Wednesday, the humpback had again looped west before doubling back to Rose Bay in Sydney’s east. 0:27 Humpback whale in Sydney Harbour followed by NSW National Parks and Wildlife Service – videoTransport for NSW said the whale caused minimal delays and disruption to its F3 Parramatta service at about 9am. Pirotta said the Wild Sydney Harbour project had “delivered” after commuters spotted the whale.